Telephone and wireless-telegraphy installation



L. N, BRILLOUIN AND G. A. BEAUVAIS.

TELEPHONE AND WIRELESS TELEGRAPHY INSTALLATION.

APPLICATION FILED JUNK-110 ,1918- Patented Jan. 31, 1922.

' 3 SHEETS-SHEET 1.

.w izmsgz $02? Jean #2413 L. N. BRILLOUIN AND G. A. BE'AUVAIS. TELEPHONEAND WIRELESS TELEGRAPHY INSTALLATION. APPLICATION FILE D JUNE I0. 1918.

Patented Jan. 31, 1922.

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Warvzegg L. N, BRILLO-UI'N AND G..A. BEAUVAIS. TELEPHONE AND WIRELESSTELEGRAPHY INSTALLATION.

APPLICATION FILED JUNE 10, I918.

Patented Jan. 31, 1922.

3 SHEETSSHEET 3.

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JUNIEN i N m'oones BRILCLOUIN, or PARIS, AND anonens amvmnn BEA-overs,or

- can-urns, LYON, FRANCE.

rnnn'rnonnan'n WIRELESS- Qriginal application filed June 13, 1917,Serial No.

TELEGRAPHY INSTALLATION.

Specification of Letters Patent. Patented Jami, 31, 1%22.

174,633. Divided and this application filed June 10,-

91s. Serial No. 239,244.

' ful Improvements in Telephone and Wire kind described in theless-'Ielegraphy Installations, (for which we have filed applications inFrance, Nov.- 7,

1916; Belgium Feb. 2, I917 Italy, Feb. 6, I

1917; Russia, arch. 24, 1917, and April, 6.

1917 England, Feb. 22, 1917,) of which the following is a specification.

The invention relates to telephone and wireless telegraphyinstallations, and it concerns more particularly installations of the U.S. patent application S. N. 174,633, filed June 13, 1917, of which thepresent application is a division, i. e. installations comprising, asamplifier, at their receiver stations, a certain number of audionshaving each a filament heated-by an electric current and two differentelectrodes i. e., a grid and a plate, the second one (plate) isconnected on the one hand, through a resistance to a source ofcurrentand on the other hand, through a condenser,

' to the first electrode (grid) of the next audion; the first electrodeof the first audion being connected to the line.

The invention has for its object to complete installations of such kindby certain auxiliary connections having for their object to modifythe'amplifying.

It has been proposed in the patent application S. N. 174,633 to connectthe plate of one audion to the grid of the same andion or to the grid ofone of the preceding audions.

In that form it is however often very difficult to ensure a regularworking; it is frequently interfered with bythe fact that the connectionbein too strong, the apparatus comes by itself into a state of electr1coscillations detected at the telephone in the form of various whistlingnoises.

According to the present invention a connection'is established betweenthe plate of one audion' and that of one of the preceding audions. V

Apart from this main arrangement, the inventlon comprises otherarrangements more fully described in the folio.

In the accompanying drawings Figs. 1 to 3 show diagrammatically receiverstations established according to the invention.

The installations shown in the drawings comprise a certain number ofspecial audions a a a a,"each having a filament a a a a a firstelectrode (grid) a a a .a' and a second electrode (plate) a a i allOOOa'mary batteries) intended to supply current for heating the filaments aa; which are connected in parallel to the terminal of the-said source;

another source of electricity "0, "intended to produce the tension 4) inthe plates c a one of the terminals of the said source bein connected tothe terminal of opposite p0 arity of the source of electricity 6 and toone of the receiver terminals e of the installation and the otherterminal of the said source 0 being connected through resistances d 03of the audions. I

In such installations the grid of each au dion is connected through acondenser F, f to the plate of the preceding audion; and the ed,if'desired, through a condenser f, to the second terminal e of theinstallation; and

IHOOO a a source of electricity Z).(storage or prirespectively to'theplates grid of the first audion is connecttentiometer 9' connectedacross the terminals of a source of current 70, one of theterminals ofwhich is connected to the positive terminal of the source of current I),owlng to which the mean voltage of, the grid can be fixed at a suitablevalue,

According to the invention the amplification obtained with suchinstallat ons 1s modified by establishing a connectlon between the plateof one audion and that of one of the preceding audions.

The two plates which are connected together are suitably selected.

It isknown that thevariat on of voltage the plate is of opposite signwith respect ice to' the variation of the grid of the same audion. llnfact, in case of an increase of voltage of the grid a the intensity orthe current passing in the plate a of the same audion increases and asthe current passing in the plate of an audion a increases, the loss ofpotential increases in the corresponding resistance ai and consequentlythe potentialin the plate a decreases; this results in a-correspondingdecrease of the voltage of the grid of the next audion and so on; thesevariations being now negative and now positive, and generally speaking,alternately negative and positive.

Now if it is desired to increase the am plification ot the installationsthe two plates to be connected together must have variations out voltageotthe same sign, for instance the plates of two audions separated by athird one.

Contrariwise, it it is desired to reduce the amplifying the two platesto be connected together must have variations of voltage or oppositesign, for instance the plates oi. two consecutive audions.

This connection can be ensured, as well in telephony as in telegraphyeither as shown in Fig. l, by a capacity m, the two electrodes of whichare respectively connected to the two lates of the two audions, or, as

shown in lFlg. 2, by a resistance n.

in a very general manner, the connection can be obtained as shown inFig. 3, by connecting a variable point of the resistance at of oneaudion to another variable point of the resistance d of another audionwith interposition in the connection or an adjustable resistance 0 andit necessary of a ca acity g0. I a everal of these connections can existointly in one and the same apparatus.

Obv1ously the invention is not limited to the methods particularlyindicated, but comprises on the contrary any modifications wltlllll thescope of the claims.

Hav ng now particularly described and ascertained the nature of our saidinvention, we declare that what we claim is:

l. lln a receiver station for telephone and wireless telegraphy,installations having a number or audions, each audion comprising afilament heated by an electric current and two dlfierent electrodesnamely a grid. and a plate, the plates of the respective audions beingconnected each through a resistance to one pole of a source of currentof suitable voltage, the other pole of which is connected to one ofthereceiver terminals, the grid of the first audion being connected to theother receiver terminal, the grid of each of the other audions beingconnected through a condenser, to the plate of the rei spectlvepreceding audion, and means for modifying the amplifying efiect of theing i i incense to one of the receiver terminals, the gridot the firstaudion being connected, on the one I hand, to the other receiverterminal, and on the other hand, through a resistance, to a fixedpositive voltage point, and the grid of each of the other audionsbeing,on the one hand, connected, each through a condenser, to the plate ofthe preceding audion, and on the other hand, to said fixed positivevoltage point through a resistance for each grid, and a connectionhaving a suitable impedance, said connection being established betweenthe plates of two suitably selected audions.

voltage, the other pole of which is connected 3 in a receiver stationfor telephone and wireless telegraphy, installations having a number ofaudions, each audion comprising a filament, heated by an electriccurrent, and two different electrodes, namely a grid and a plate, theplates of the respective audions being connected, through a resistancefor each plate, to one pole of a source of current of suitable voltage,the other pole of which is connected to one of the receiver terminals,the grid of the first audion being connected, on the one hand, to theother receiver terminal and, on the other hand, through a resistance, toa fixed positive voltage point, the grids of the other audions beingeach connected, on the one hand, to said fixed positive voltage point,through a resistance established for each grid, and on the other hand,through a condenser, to the plate of the preceding audion, and aconnection comprising an adjustable resistance, said connection beingestablished between the plates of two suitably selected audions.

4t. lln a receiver station for telephone and llltl wirelessinstallations,having a number of' age point, the grids of the otheraudions our hands in presence of subscribing witbeing each connected, onthe one hand, to nesses.

said fixed positive voltage point, through N NICOLAS BRILLOUIN.

a resistance established for each rid and on the other hand, through acon enser, to EE ARMANI) BEAUVAIS' itnesses:

the plate of the preceding audion, and a connection comprising anadjustable resistance CHAS. P. PREssLY,

and a condenser established between the LUGENE PULKEY,

plates of two suitably selected audions. ETIENNE DEMEME,

In testimony whereof we have hereunto set MARCUS CARRIE.

